Diabetes is a long-term health condition that affects how your body regulates blood glucose, commonly called blood sugar. It develops when the body does not produce enough insulin, does not use insulin effectively, or both.
Some people notice symptoms such as increased thirst, frequent urination, tiredness, blurred vision or unexplained weight loss. However, especially with type 2 diabetes, symptoms can be mild or absent for a long time. That is why appropriate blood-sugar testing is important for people with symptoms or risk factors.
This guide explains what diabetes is, its main types, common symptoms, causes and risk factors, how diabetes is diagnosed, and what you can do to reduce the risk of type 2 diabetes.
Quick Summary
| Topic | Key Information |
|---|---|
| What is diabetes? | A condition in which blood glucose remains higher than the healthy range because insulin production or insulin action is impaired |
| Common symptoms | Increased thirst, frequent urination, hunger, fatigue, blurred vision and unexplained weight loss |
| Main types | Type 1, Type 2 and gestational diabetes |
| Important risk factors | Family history, overweight or obesity, physical inactivity, increasing age and previous gestational diabetes, among others |
| Common diagnostic tests | HbA1c, fasting plasma glucose, oral glucose tolerance test and, in appropriate situations, random plasma glucose |
| Can type 2 diabetes be delayed? | Lifestyle changes can help prevent or delay type 2 diabetes, particularly in people with prediabetes |
| Can symptoms alone diagnose diabetes? | No. Diabetes is diagnosed using appropriate blood tests |
What Happens in the Body When You Have Diabetes?
When you eat, your body breaks carbohydrates and other nutrients down into glucose. Glucose enters the bloodstream and provides energy for the body’s cells.
Insulin is a hormone made by the pancreas. It helps glucose move from the bloodstream into cells, where it can be used for energy.
In diabetes, this system does not work properly. The body may produce too little insulin, the cells may not respond properly to insulin, or both.
When blood glucose stays high over time, it can damage blood vessels and other tissues. Diabetes is associated with complications affecting the heart, kidneys, eyes, nerves and blood vessels.
What Are the Common Symptoms of Diabetes?
For a related guide, see diabetes symptoms and causes.
Common symptoms can include:
- Feeling unusually thirsty
- Urinating more frequently than usual
- Feeling very hungry
- Feeling unusually tired
- Blurred vision
- Unexplained weight loss
Some people may also experience recurrent infections or wounds that take longer to heal.
However, symptoms vary from person to person. Type 1 diabetes can develop quickly, sometimes over days or weeks, while type 2 diabetes may develop gradually and may cause few or no noticeable symptoms for a long time.
Important: Having one or more of these symptoms does not automatically mean you have diabetes. A blood test is needed for diagnosis.
Why Can Diabetes Go Unnoticed?
Type 2 diabetes can develop gradually. Some people may not notice obvious symptoms until their blood glucose has been elevated for some time.
Prediabetes can also occur without clear symptoms. This means a person may feel completely well while blood glucose is already above the normal range.
Testing is therefore important for people who have symptoms or risk factors, even when they feel healthy.
Types of Diabetes
For a detailed comparison, read Type 1 vs Type 2 diabetes.
1. Type 1 Diabetes
Type 1 diabetes is an autoimmune condition. The immune system mistakenly attacks the insulin-producing beta cells in the pancreas, resulting in little or no insulin production.
Type 1 diabetes can occur at any age, although it commonly develops in children, teenagers and young adults.
People with type 1 diabetes need insulin to survive. It is not caused simply by eating sugar or by having an unhealthy lifestyle.
2. Type 2 Diabetes
Type 2 diabetes is the most common form of diabetes.
It develops when the body does not use insulin effectively and, over time, may not produce enough insulin to maintain normal blood glucose levels.
Risk is influenced by several factors, including genetics, age, body weight, physical activity and other health conditions. Type 2 diabetes can often be prevented or delayed in people at increased risk through lifestyle changes.
3. Gestational Diabetes
Gestational diabetes develops during pregnancy.
It usually means blood glucose is higher than normal during pregnancy but does not meet the criteria for diabetes outside pregnancy.
Gestational diabetes requires appropriate medical monitoring because it can affect pregnancy and is associated with an increased future risk of type 2 diabetes for the mother.
4. Prediabetes
Prediabetes means blood glucose is higher than normal but not high enough to meet the diagnostic criteria for diabetes.
Prediabetes often does not cause obvious symptoms.
It is an important warning stage because people with prediabetes have an increased risk of developing type 2 diabetes. Lifestyle changes can help reduce that risk.
What Causes Diabetes?
There is no single cause for all types of diabetes.
Factors associated with Type 1 diabetes
Type 1 diabetes is primarily associated with an autoimmune reaction in which the body’s immune system attacks insulin-producing cells. Family history can increase risk, but the exact cause is not completely understood.
Risk factors for Type 2 diabetes
- Family history of type 2 diabetes
- Overweight or obesity
- Low physical activity
- Increasing age
- Previous gestational diabetes
- Prediabetes
- Certain other health conditions
Having a risk factor does not mean that someone will definitely develop diabetes.
Diabetes and India
Diabetes is an important public-health issue in India. The risk of type 2 diabetes is influenced by a combination of genetic, metabolic, lifestyle and environmental factors.
Rather than relying only on symptoms, appropriate screening and early testing can help identify abnormal blood glucose levels before complications develop.
For an individual, the right time to test depends on symptoms, risk factors, age, pregnancy status and medical history. A healthcare professional can advise which test is appropriate.
How Is Diabetes Diagnosed?
Diabetes is diagnosed using blood glucose tests. A home glucometer can help monitor blood glucose, but a personal glucose-meter reading should not be used by itself to diagnose diabetes.
Common diagnostic tests include:
HbA1c Test
Read our detailed HbA1c test guide for more information about HbA1c ranges and testing.
HbA1c, also called A1C, measures average blood glucose levels over approximately the previous three months.
| HbA1c result | Interpretation |
|---|---|
| Below 5.7% | Normal range |
| 5.7%–6.4% | Prediabetes |
| 6.5% or above | Diabetes range |
An abnormal result may need confirmation with repeat testing, particularly when there are no clear symptoms. Certain conditions affecting red blood cells or hemoglobin can also affect the accuracy of an A1C result.
Fasting Plasma Glucose Test
This test measures blood glucose after fasting for at least 8 hours.
| Fasting plasma glucose | Interpretation |
|---|---|
| 99 mg/dL or below | Normal range |
| 100–125 mg/dL | Prediabetes |
| 126 mg/dL or above | Diabetes range |
A diabetes-range result may need confirmation depending on the circumstances.
Oral Glucose Tolerance Test
An oral glucose tolerance test, or OGTT, measures how the body responds to a measured glucose drink.
For non-pregnant adults, a two-hour glucose result of:
- 140–199 mg/dL is in the prediabetes range
- 200 mg/dL or above is in the diabetes range
Pregnancy uses different testing approaches and thresholds, so pregnant women should follow the testing protocol recommended by their healthcare professional.
Random Plasma Glucose Test
A random plasma glucose test can be performed without fasting.
When a person has symptoms of diabetes, a random plasma glucose level of 200 mg/dL or above can be used as a diagnostic criterion. The overall clinical situation and appropriate confirmation are important when making a diagnosis.
Which Diabetes Test Should You Take?
There is no single test that is appropriate for everyone.
The choice may depend on:
- Whether you have symptoms
- Your risk factors
- Whether you are pregnant
- Your medical history
- Previous test results
If you are concerned about diabetes, speak with a qualified healthcare professional about which test is appropriate for you.
When Should You Consider Getting Tested?
Testing is particularly worth discussing with a healthcare professional if you:
- Have symptoms suggestive of diabetes
- Have a family history of diabetes
- Have overweight or obesity
- Have previously been diagnosed with prediabetes
- Have had gestational diabetes
- Have other health conditions associated with diabetes risk
- Have been advised by your healthcare professional to undergo screening
People can have prediabetes or type 2 diabetes without obvious symptoms, which is one reason appropriate screening matters.
Can Type 2 Diabetes Be Prevented or Delayed?
If you want practical food guidance, see our Indian diabetic diet chart.
Not every case of type 2 diabetes can be prevented, because genetics and other factors also play a role.
However, lifestyle changes can help prevent or delay type 2 diabetes, particularly among people with prediabetes or other risk factors.
Helpful habits include:
- Being physically active regularly
- Choosing a balanced eating pattern
- Maintaining a healthy weight or working toward a healthier weight if advised
- Limiting sugar-sweetened drinks and highly processed foods
- Getting adequate sleep
- Following medical advice for other conditions such as high blood pressure or abnormal cholesterol
What About Diabetes Treatment?
Treatment depends on the type of diabetes and the individual’s medical situation.
Depending on the type and stage, diabetes care may include:
- Healthy eating
- Regular physical activity
- Blood glucose monitoring
- Medicines prescribed by a healthcare professional
- Insulin when required
- Regular medical follow-up
There is no single treatment plan that works for everyone. Do not start, stop or change diabetes medicines without medical advice.
Monitoring Blood Sugar at Home
People who have diabetes may be advised to monitor blood glucose at home using a glucometer.
Home monitoring can be useful for understanding blood glucose patterns and for following a treatment plan, but a glucometer reading is not a substitute for professional diagnosis or medical follow-up.
If you already have diabetes, follow the monitoring schedule recommended by your healthcare professional.
Why Early Diagnosis Matters
Finding diabetes or prediabetes early gives people an opportunity to take appropriate action.
Persistently high blood glucose can contribute to complications affecting:
- Heart and blood vessels
- Kidneys
- Eyes
- Nerves
- Feet
Early identification and appropriate management can help reduce the risk of diabetes-related complications.
HealthPartner India: Help With Diabetes Tests and Healthcare Assistance
HealthPartner India helps customers with healthcare assistance, including medicine-ordering support and lab-test booking.
Our current healthcare partner network includes:
- Tata 1mg, where the relevant service is available
Availability of specific medicines, laboratory tests, locations, discounts and services can vary by partner and location.
Need a Diabetes Test?
You can contact HealthPartner India to ask about available options for tests such as:
- HbA1c
- Fasting Blood Sugar
- Diabetes screening packages
- Other health-checkup packages
Send Prescription on WhatsApp or message us to check available healthcare options.
Medical References
These clinical resources explain diabetes, its types and diagnostic testing. Diagnosis should be based on appropriate laboratory testing and clinical assessment; a home glucose-meter reading alone cannot establish diabetes.
- NIDDK — Diabetes Overview
- NIDDK — Diabetes Tests & Diagnosis
- American Diabetes Association — Diabetes Diagnosis
Frequently Asked Questions
1. What is diabetes?
Diabetes is a chronic condition in which blood glucose levels become too high because the body does not produce enough insulin, does not use insulin effectively, or both.
2. What are the early symptoms of diabetes?
Common symptoms include increased thirst, frequent urination, increased hunger, fatigue, blurred vision and unexplained weight loss. However, type 2 diabetes can also have few or no noticeable symptoms.
3. Can symptoms alone diagnose diabetes?
No. Symptoms may indicate that testing is appropriate, but diabetes is diagnosed using appropriate blood tests.
4. What is the HbA1c level for diabetes?
For non-pregnant adults, an HbA1c of 6.5% or above is within the diabetes diagnostic range. Diagnosis may require confirmation, particularly when there are no clear symptoms.
5. What fasting blood sugar level indicates diabetes?
For non-pregnant adults, a fasting plasma glucose result of 126 mg/dL or above is within the diabetes diagnostic range. Appropriate confirmation is generally required.
6. Can type 2 diabetes be prevented?
Type 2 diabetes cannot always be prevented, but lifestyle changes can help prevent or delay it, particularly in people with prediabetes or increased risk.
7. Is type 1 diabetes caused by eating too much sugar?
No. Type 1 diabetes is an autoimmune condition and is not simply caused by eating sugar or having an unhealthy lifestyle.
8. Can a glucometer diagnose diabetes?
A home glucose meter is useful for monitoring blood glucose, but it should not be used by itself to diagnose diabetes. Diagnosis should be based on appropriate laboratory testing and clinical evaluation.
9. Does prediabetes mean I have diabetes?
No. Prediabetes means blood glucose is above the normal range but below the diagnostic threshold for diabetes. It is an important risk state that can progress to type 2 diabetes.
10. How can HealthPartner India help?
HealthPartner India provides assistance with medicine-order and lab-test enquiries through Tata 1mg where the relevant service is available. Contact us on WhatsApp to ask about the next steps.
Key Takeaways
- Diabetes affects the way the body regulates blood glucose.
- Type 1, type 2 and gestational diabetes have different causes and characteristics.
- Type 2 diabetes may develop gradually and sometimes causes no obvious symptoms.
- Symptoms such as increased thirst, frequent urination, fatigue, blurred vision and unexplained weight loss can occur with diabetes.
- Diabetes is diagnosed using appropriate blood tests, not symptoms alone.
- HbA1c, fasting plasma glucose, OGTT and random plasma glucose are among the tests used in appropriate situations.
- Prediabetes increases the risk of type 2 diabetes.
- Lifestyle changes can help prevent or delay type 2 diabetes in many people at increased risk.
- If you have symptoms or risk factors, discuss appropriate testing with a qualified healthcare professional.
Need Help With a Diabetes Test?
HealthPartner India can help you check available diabetes-testing and healthcare options through our partner network.
Send Prescription on WhatsApp: +91 93479 68950
Medical Disclaimer: This article is intended for general educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis or treatment. Diabetes diagnosis and treatment should be determined by a qualified healthcare professional based on your symptoms, medical history and appropriate test results. Do not start, stop or change medicines without professional medical advice.
Sources & Further Reading
- World Health Organization — Diabetes
- National Institute of Diabetes and Digestive and Kidney Diseases — Diabetes Tests & Diagnosis
- National Institute of Diabetes and Digestive and Kidney Diseases — The A1C Test & Diabetes
- Centers for Disease Control and Prevention — Diabetes Testing and Type 2 Diabetes Prevention